“分数的基本性质”教材是以复习旧知识引出新课题的形式安排的,教学过程如下。复习:80÷20的商是多少?被除数和除数都扩大5 倍,商是多少?被除数和除数都缩小10倍呢? 例1:把4张相同的纸条分别平分成2份、4份、6份和 8份,并按照下图涂色。如把每张纸条都看作单位“1”, 请你把涂色的部分用分数表示。 The basic nature of the score textbook is arranged in the form of reviewing the old knowledge and leads to a new topic. The teaching process is as follows. Review: What is the quotient of 80 ÷ 20? The number of divisors and divisors is increased by 5 times, what is the quotient, and the dividend and divisor are reduced by 10 times? Example 1: Divide the four identical strips into two, four, 6 and 8, and color the following picture. If each piece of paper as a unit of “1”, please color the painted part of the said.